Abstract: An arc tube for a high pressure metal vapor discharge lamp is provided. The arc tube of the present invention comprises a tubular ceramic envelope; a chemical fill within said envelope; a seal button at each end of said envelope; said seal button having an aperture therethrough for receiving a feedthrough member; a feedthrough member having an electrode projecting therefrom passing through said seal button aperture and being oriented such that the electrode projects into said tubular ceramic envelope, said feedthrough member being sealed into said seal button by means of a fritless seal between said seal button and said feedthrough; and sealing frit material sealing said seal buttons into the ends of said tubular ceramic envelope. A method for fabricating the above-described arc tube and high pressure metal vapor discharge lamp including the above-described arc tube is also provided.

Abstract: The present invention is directed to a method of eliminating the cold spot zones presently used on Hg.sup.196 isotope separation lamps and filters by the use of a mercury amalgams, preferably mercury - indium amalgams. The use of an amalgam affords optimization of the mercury density in the lamp and filter of a mercury enrichment reactor, particularly multilamp enrichment reactors. Moreover, the use of an amalgam in such lamps and/or filters affords the ability to control the spectral line width of radiation emitted from lamps, a requirement for mercury enrichment.

Abstract: In a mine tool of the type having a drive body holding a bit, the bit includes forwardly projecting support lands holding a cutting insert wherein the lands have a maximum dimension as measured in a direction perpendicular to a respective side surface of the cutting insert of less than about fifteen percent of the lengthwise dimension of the insert.

Abstract: Tungsten and molybdenum are recovered from sulfur bearing material such as sulfide sludges by a pollution free process in which the sulfur bearing material is heated with agitation in an aqueous solution of sodium carbonate to form water soluble molybdenum and tungsten compounds without forming any appreciable amount of water soluble sulfur compounds. The reaction mixture is oxidized to convert partially reduced tungsten values or molybdenum values to sodium tungstate and sodium molybdate respectively. The liquid phase containing tungsten and molybdenum is separated from the solid phase containing free sulfur.

Abstract: In a process for producing a carbide grade powder mixture for making a cemented metal carbide, a mixture of metal carbide particles and wax is formed at a temperature above the melting point of the wax. The wax includes less than about 2 percent by weight of a wetting agent for reducing the surface tension of the wax when in water. The blended mixture including metal binder particles is milled with a liquid milling medium comprising water to substantially uniformly disperse the metal binder particles and to produce a slurry. The slurry is dried to remove the milling medium and produce a powder comprising particles of metal carbide, metal binder and wax.

Abstract: Metal carbide is reclaimed from scrap by sorting the scrap to separate pieces of cemented carbide having similar composition and grain size and treating the separated portion to form metal carbide grains which may be resintered with metal binder to obtain cemented carbides having grain characteristics similar to the starting material.

Abstract: A free flowing plasma spray powder of substantially spherical particles having substantially smooth surfaces and of uniform composition consisting essentially of about 4 to about 6 percent by weight rhenium with the balance being tungsten.

Abstract: Tungsten and cobalt metal are recovered from cemented carbides by the electrolytic disintegration of the cemented carbide as the anode in an aqueous electrolyte containing a soluble alkali metal hydroxide. Tungsten carbide is thus converted to carbide particles, which precipitate from the electrolytic solution. The cobalt metal is precipitated in the electrolyte or plated on the cathode. The cobalt metal is then recovered by separation of a cobalt salt, followed by thermal reduction of the salt.

Abstract: In a process for producing fine cobalt metal powder from scrap material containing brazing compositions, the scrap is digested with hydrochloric acid to form a cobalt chloride solution which the silver is removed by precipitation with a suitable alkali metal halide at a pH of about 7 to result in a cobalt amine chloride solution which is further processed to fine cobalt powder.